Inspecția certificatului de siguranță a cărbunelui la fiecare câțiva ani

As per available information, the duration is five years.

Only products that have secured a coal safety certification certificate and a third-party test report are eligible to bear the coal safety (MA) mark. Both the coal safety (MA) mark and the third-party test report are valid for a period of five years. Once this period elapses, it is necessary to undergo the certification process anew.